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Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Mayfly Species Ephemerella dorothea infrequens (Pale Morning Dun)

This is page 1229 of specimens of Ephemerella dorothea infrequens. Visit the main Ephemerella dorothea infrequens page for:

  • The behavior and habitat of Ephemerella dorothea infrequens.

Specimens of the Mayfly Species Ephemerella dorothea infrequens

3 Male Spinners
1 Female Spinner
Female Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Spinner
I'm calling this one Ephemerella dorothea infrequens because it was collected along with two males that positively ID to that species.
1 Male Dun
Male Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Dun
This dun was collected in proximity to this spinner.
1 Nymph
Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Nymph
Habitat: Shallow riffle over cobble; approx. 1 ft. deep
Size: 8.5 mm. Mature specimens have been captured as large as 10.5 mm.
Emergence schedule: Variable - starting as early as mid March and lasting as late as early June, depending on the year. Usual duration is at least several weeks or more.
Dun Association: Body is elusive pale creamy yellow w/ orange highlights, cream legs and tails, and dun wings
Specimen status in photo: Preserved
Collection method: Kick net

Comments: Extremely common in samples taken from this location. It's color in life was very close to as depicted in the photo; except for the gradual darkening of the abdominal segments as they progress posteriorly, which has been accentuated somewhat by the effects of preservation. Adult association is based upon capture of this taxon at various stages of emergence including: darkened wingcases, split thoraxic notums, and partially ecloded or ''stillborn'' specimens.

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